Would a sentient AI try to create a more optimised AI which would eventually overtake AI 1.0?
A common concept in AI is "recursive self-improvement." That is, the AI 1.0 would build a version 1.01, which would build a version 1.02, and so on.

This is probably not going to be thought of as the newer version 'destroying' the older version; if an AI can self-modify, it's probably going to be more like going to sleep and waking up smarter, or learning a new mental technique, or so on.

One important point is that even if the AI is not allowed to self-modify, maybe because of a block put in by its programmers, that won't necessarily prevent it from constructing another AI out in the wild, and so an important problem is to figure out how to best generalize the concept of "don't improve yourself" so that we can make AIs that have bounded scope and impact.